摘要
以丙烯酸(AA)和2-甲基丙烯酰氧乙基磷酰胆碱(MPC)为单体,采用RAFT聚合合成系列共聚物(P(AA-co-MPC)),并通过化学共沉淀法制备P(AA-co-MPC)表面修饰的磁性Fe3O4纳米粒子。利用1H NMR,FTIR,GPC,TG,TEM,XRD,Zeta电位及粒度分析仪和Squid-VSM磁性测量系统等手段对共聚物和纳米粒子进行表征。结果表明:采用RAFT聚合成功合成了窄分子量分布的P(AA-co-MPC),磁性Fe3O4纳米粒子表面含有修饰基团;单体摩尔比(AA∶MPC)为1∶1时合成的共聚物修饰磁性Fe3O4纳米粒子的分散性最好,具有最小的水合粒径(36.54±4.00)nm和最窄的粒径分布,最高的Zeta电位(-30.98±1.25)mV,饱和磁化强度为65.57A·m^2·kg^-1,剩磁和矫顽力均为零,具有超顺磁性。
A series of copolymers (P(AA-co-MPC)) with acrylic acid (AA) and 2-methacryloy-loxyethyl phosphorylcholine (MPC) monomers were synthesized via RAFT polymerization. Then the magnetic iron oxide nanoparticles were modified by these synthesized copolymers through chemical coprecipitation method. Copolymers and the nanoparticles were characterized by 1H NMR, FTIR, GPC, TG, TEM, XRD, Zeta potential and particle size analyser, and Squid-VSM magnetic measure system. The results show that the P(AA-co-MPC) with narrow molecular mass distribution is successfully synthesized by RAFT polymerization and the surface of the magnetic iron oxide nanoparticles is modified by these copolymers. The modified magnetic iron oxide nanoparticles by copolymer synthesized with the monomer molar ratio of AA∶MPC of 1∶1 exhibit the best dispersion, the smallest hydrodynamic particle size (36.54±4.00) nm, the narrowest particle size distribution and the highest Zeta potential (-30.98±1.25) mV. The saturation magnetization is 65.57A·m^2·kg^-1 . The nanoparticles show superparamagnetism, with no residual magnetism and zero coercive force.
作者
桑冀蒙
李学平
赵瑾
侯信
原续波
SANG Ji-meng;LI Xue-ping;ZHAO Jin;HOU Xin;YUAN Xu-bo(Tianjin Key Laboratory of Composite and Functional Materials,School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2019年第8期82-89,共8页
Journal of Materials Engineering
基金
国家自然科学基金项目(51673146)
天津市自然科学基金面上项目(18JCYBJC18300)
